ACE 객체 추출 알고리즘을 이용한 다중 멀티미디어 검색 시스템의 개발

정석훈,강대성 東亞大學校附設 情報技術硏究所 2005 情報技術硏究所論文誌 Vol.13 No.1

In this paper, We propose a user friendly object-based multimedia retrieval system using the HCNN(HippoCampus Neural Network). Most existing approaches to content~based retrieval rely on query by example or user based low-level features such as color, shape, texture. In this paper we perform a scene change detection and key frame extraction for the compressed video stream that is video compression standard such as MPEG. We propose a method for automatic color object extraction and ACE(Adaptive Circular filter and Edge detection) of content-based multimedia retrieval system. And we compose multimedia retrieval system after learned by the HCNN such extracted features. Proposed HCNN makes an adaptive real-time content-based multimedia retrieval system using excitatory learning method that forwards important features to long-term memories and inhibitory learning method that forwards unimportant features to short-term memories controlled by impression.

2.1GHz 대역의 저잡음 증폭기 설계

정태훈,한대현,최영식 東義大學校産業技術開發硏究所 2003 産業技術硏究誌 Vol.17 No.-

본 논문에서는 IMT-2000 기지국(중계기)용 저잡음 증폭기에 적합한 저 전압, 저 전류 동작점을 설정하고 이와 동시에 낮은 잡음 특성과 높은 입력 인터셉트점을 가지는 증폭기를 설계하였다. 입력 부정합에 의한 높은 입력 IP_3를 얻기 위하여 50Ω에 가까운 최적의 잡음지수를 얻기 위한 반사계수 값이 아닌 0.3㏈ 이하의 일정 잡음지수원 상에서 보다 적절한 부정합을 얻을 수 있는 입력 반사계수를 설정하고 출력을 복소 정합회로로 설계하여 두 특성을 최대로 얻을 수 있게 하였다. 본 논문에서는 최근 통신소자로 각광받고 있는 HEMT소자를 사용하였으며 Agilent사의 pHEMT ATF-36077을 능동소자로 채택하고 Agilent사의 고주파 시뮬레이터인 ADS를 이용하여 회로 설계 및 모의실험, 회로 및 성능의 최적화를 수행 하였으며 모의실험 결과를 활용하여 유전율 ε_r=3.0, 두께 0.762㎜인 테프론(Teflon) 기판을 이용하여 제작하였다. 구현한 저잡음 증폭기는 정합 및 바이어스의 최적화를 수행하여 기지국(중계기)용으로 제작되었으며 V_(ds)=2[V], I_d=9[mA]의 동작특성과 낮은 잡음특성, 높은 입력 인터셉트점, 그리고 입/출력에서 양호한 정합 특성을 얻을 수 있었다.

Multiple Spinal Intradural Schwannomas Combined with Sequestered Lumbar Disc Herniation

김대용,김진욱,정주호,조재훈 고신대학교 의과대학 2008 고신대학교 의과대학 학술지 Vol.23 No.2

In this report, we describe a case of multiple intradural schwannomas in the spine combined with a upward sequestered disc herniation at L4-L5. It is often difficult to differentiate this tumor from lumbar disc herniation, especially a sequestered hernia. Gadolinium-enhanced MR images were a useful preoperative examination modality for differentiating these lesions from other diseases. Microscopically, the intradural tumors were successfully removed. The dura maters of the L2 and S1 were opened microsurgically, allowing the nerve fibers involved in the tumor to be identified. The involved fibers were cut around the tumor, and the lesion was resected while the intact nerve fibers were preserved. An upward sequestered lumbar disc herniation at L4-L5 was also successfully removed. Based on histological examination of the resected specimen, the tumors were diagnosed as schwannomas. Microsurgery allowed the tumors to be removed with minimal impairment from cutting of nerve fibers in the each nerve root.

객체 추출 알고리즘을 이용한 내용기반검색

정석훈,강대성 東亞大學校附設情報技術硏究所 2005 情報技術硏究所論文誌 Vol.12 No.2

Recently there have been many efforts to support searching and browsing based on the visual content of image and multimedia data. Most existing approaches to content-based image retrieval rely on query by example or user based low-level features such as color, shape, texture. But these methods of query are not easy to use and restrict. In this paper we propose a method for automatic color object extraction of content-based image retrieval system. Theses approaches simplify the regions within images using similar colorizing algorithm and extract color object using proposed Color and Spatial based Binary tree map(CSB tree map). This allows very fast indexing of the image by color contents of the images and spatial attributes. Futhermore, information about the labelled regions, such as the color set, size, and location, enables variable multiple queries that combine both color content and spatial relationships of regions. We proved our proposed system to be high performance through experiment comparable with another algorithm using "Washington" image database.

혈액투석 환자에게서 발생한 재생불량성 빈혈 1예

정지용,윤나라,강대웅,오종찬,장재현,선길홍,박경희,정종훈,김현리 朝鮮大學校 附設 醫學硏究所 2005 The Medical Journal of Chosun University Vol.30 No.1

Aplastic anemia is a disease characterized by pancytopenia in the peripheral blood and hypocellular bone marrow with the fatty infiltration. The causes of the acquired aplastic anemia were usually related to drugs and immune-related diseases. A 34-years old man was admitted due to general weakness. He has been going hemodialysis for 2 years because of end stage renal disease (ESRD) due to chronic glomerulonephritis. At admission, laboratory tests showed hemoglobin 6.2 g/dL, hematocrit 18.0 %, WBC 5,710mm (neutrophil 71.8%, lymphocyte 19.1%, monocyte 5.9%), reticulocyte 1.9%, platelet 93,000/mm, Fe 12.8 ug/dL, TIBC 204 ug/dL, ferritin 941.47 ng /ml, haptoglobin 0.72 g/L, vitamin B12 508.17 pmol/L, folate 24 ng/mL, total protein 6.54 g/dL, albumin 3.76 g/dL, Alk. pohsphatase 79 IU/L, AST 30.0 IU/L, ALT 39.7 IU/L, total bilirubin 0.57 mg/dl, BUN 79.4 mg/dl and creatinine 10.18 mg/dl. Peripheral blood smear showed the normocytic normochromic anemia with anisocytosis. Anemia was diagnosed but it was irresponsive to the recombinant human erythropoietin (EPO) and blood transfusion. In the bone marrow aspiration smear were there the hypoplastic myeloid and erythroid precursors. The bone marrow biopsy section showed the hypoplasia of all components (10-20%) and the fatty infiltration. We have experienced one case of the idiopathic aplastic anemia in a patient going through hemodialysis and we just report it with documentary records. 저자들은 혈액 투석 중인 환자에서 약물, 면역계 이상등의 원인을 발견할 수 없었음에도 재생 불량성 빈혈이 발생한 1예를 경험하여 문헌 고찰과 함께 보고하는 바이다.

폴리메틸렌 스페이서로 연결된 Cholesterol-twins의 합성과 이들의 열방성 액정의 특성

마영대,정승용,최정훈 단국대학교 2001 산업기술연구 Vol.2 No.-

Cholesterol-twins connected with central methylene chains (Cho-TW-n, where n, the number of methylene group, is 2, 4, 6, or 8) were prepared, and their thermal and mesomorphic properties were investigated. Among the samples, only Cho-TW-4 exhibited an enantiotropic cholesteric phase and the remainder a monotropic one. The monotropic isotropic-cholesteric and crystallization temperatures of the derivatives decreased irregularly with increasing n up to 6, after which they were virtually constant. All samples, which exhibit reflection colors over the full cholesteric range, formed left-handed helicoidal structures whose optical pitches (λ_ms) decrease with increasing temperature. It was also found that the temperature dependence of λ_m was virtually identical for all compounds. However, the magnitude of λ_m at the same temperature was sensitive to n.

분자역학적 방법을 이용한 부산시내 대형건물 냉각탑수의 레지오넬라균의 형별 분류

김정만,정석훈,서대영,박은희,송은주,최재철,이은엽,장철훈 대한임상미샐물학회 2004 Annals of clinical microbiology Vol.7 No.1

十全大補湯이 抗癌劑를 投與한 생쥐의 胸腺細胞에 미치는 影響

金大根,殷載淳,全薰,宋正模 대한본초학회 1998 大韓本草學會誌 Vol.13 No.2

The purpose of this research was to investigate effects of Sipjeon-Daebo-Tang(SDT) on thymocytes of anti-tumor drugs administered mice. DNA fragmentation, mitochondrial transmembrane potential and subpopulation were tested using a flow cytometry. and the cell viability was tested using a MTT assay. Etoposide, vincristine and doxorubicin enhanced DNA fragmentation and reduced mitochondrial transmembrane potential of thymocytes, but SDT recoverd the action of vincristine and doxorubicin. Etoposide or vincristine decreased the population of CD4 single positive cell in thymocytes, but SDT enhanced the population of CD4+ single positive cell. Etoposide, vincristine and doxorubicin decreased the cell viability of thymocytes, but SDT enhanced the cell viability. These results suggest that SDT has a regulative function of thymocytes in anti-tumor drugs administered mice.

열간압연시 판재내의 변형률과 온도분포가 압하력에 미치는 영향

김대영,박종진,송정훈 弘益大學校 科學技術硏究所 1997 科學技術硏究論文集 Vol.8 No.-

In sheet rolling, the hydraulic pressure at the rolling stand controls the roll gap which determines the thickness of a rolled sheet. Therefore, it is necessary to predict the rolling force for a given set of rolling conditions such as sheet material, initial thickness, final thickness, temperature, rolling speed, roll diameter and friction condition. In this study, the rigid plastic finite element method was applied to the prediction of the rolling force. The comparison of the analysis results with expermients showed discrepancies between -15% to 6%. In conclusion, a more rigorous analysis would be necessary for an accurate prediction which includes considerations of nonuniform distritributions of temperature in the sheet and the elastic deformation of rolls.

아연 전처치가 카드뮴 급성 중독에 미치는 영향에 대한 실험적 연구

이정훈,최정목,강대영 충남대학교 의과대학 지역사회의학연구소 1996 충남의대잡지 Vol.23 No.2

In an attempt to elucidate the effects of zinc on rat tissue changes induced by cadmium, the present study was undertaken in male Sprague-Dawley rats. Rats were intraperitoneally pretreated with zinc chloride(15.0mg/kg) for 3 days, and then were intraperitoneally given CdCl_2(3.0mg/kg). The body and organ weights of the experimental rats were weighed on the 1st, 3rd, 7th, 15th, 30th and 60th day after CdC_12 injection. The lungs, livers, kidneys and testes were microscopically illuminated and examined under the electron microscope. The results were as follows: 1. The cadmium induced toxicity were most prominent in the testes. The testes showed diffuse hemorrhage, followed by massive hemorrhagic necrosis, calcification and complete disappearance of normal parenchymal tissue(severe atrophy). 2. In the zinc treated group, there were no specific light microscopic changes in the organs. Marked ultrastructural changes were not observed, however the number of glycogen particles increased. 3. The cadmium toxicity to the lung was proportional to the number of days. The lung changes showed chronic bronchitis and progressive interstitial fibrosis of the alveoli. 4. In the cadmium treated group, the liver showed ultrastructural changes such as mitochondrial swelling, dilatation of rough endoplasmic reticulum, myelin figure formation, and decreased number of glycogen particles. The degree of ultrastructural changes slightly decreased in the zinc pretreated group. Also nuclear membrane irregularity was noted after experimental 30th day. 5. After 30th experimental day in the cadmium treated group, ultrastructural appearence of the proximal convoluted tubules of the kidneys showed detachment of microvilli, absence of basal cytoplasmic membrane invagination and irregular mitochondrial shape. In the zinc pretreated group, the degree of ultrastructural changes were mild compared to those of the cadmium only treated group. In conclusion, these experimental results suggest that cadmium toxicity was most prominent in the testes and can be the cause of infertility, and that zinc reduces ultrastructural cellular damage induced by cadmium in the rat tissues.